dagen: president obama briefed this morning. we are looking at this live breast priest -- press briefing- press briefing. meantime in washington president obama was briefed this morning on the boston investigation. the man had. we go to rich jensen at the white house with the latest. >> reporter: a very fluid situation. the national security staff convening about an hour-long briefing this morning that ended -t about -- probably an hour ago. we were supposed to get a briefing in new from the press secretary, just a regular is scheduled briefing, the daily briefing. that has been pushed off, postponed to a time to be determined. we are learning now also comes from capitol hill. his reporting, is senior source on capitol hill was brief but a national data terrorism center saying that police believed dzhokhar tsarnaev is still in the boston area and it is important they get all the time and do so live because they want to find out if this is something broader. there is another person involved those sources saying it is hard to beli